What is the burden of persuasion against the prosecution in a case of assault?

At trial, the People have the burden of persuasion to show the nonexistence of a defense that negates an element of crime "beyond a reasonable doubt." (People v. Saavedra (2007) 156 Cal.App.4th 561, 570.) "Typically, the prosecution has the burden to prove a defendant did not act in self-defense, because self-defense negates an element of the offense." (Id. at p. 571.) " 'To justify an act of self-defense for [an assault charge . . . ], the defendant must have an honest and reasonable belief that bodily injury is about to be inflicted on him. [Citation.]' [Citation.] The threat . . . must be imminent

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[citation], and '. . . any right of self-defense is limited to the use of such force as is reasonable under the circumstances.' " (People v. Minifie (1996) 13 Cal.4th 1055, 1064-1065, italics omitted.) "[A]lthough the test is objective, reasonableness is determined from the point of view of a reasonable person in the defendant's position. The jury must consider all the facts and circumstances it might ' "expect[ ] to operate on [defendant's] mind." ' " (Id. at p. 1065.)